Breaking News
News & Analysis

Medical Devices Require Radiation-Tolerant Memory

7/8/2014 11:30 AM EDT
8 comments
NO RATINGS
More Related Links
View Comments: Newest First | Oldest First | Threaded View
DrQuine
User Rank
CEO
Medical Devices Tolerating Cremation or Accidents
DrQuine   7/23/2014 9:49:37 AM
NO RATINGS
Another challenging issue is the need for medical devices to tolerate cremation (or accidents) without releasing toxic materials even after the patient dies. In the instance of plutonium powered heart pacemakers this was a serious issue. While the dead patient wouldn't care, the release of plutonium into the environment during cremation was a serious concern. Physical shielding accounted for a significant portion of the bulk of the device.

resistion
User Rank
CEO
Re: Choice of radiation for sterilization
resistion   7/9/2014 11:02:15 PM
NO RATINGS
Floatiing gate is not radiation hard, it would be used with radiation shields.

goafrit
User Rank
Manager
Re: Choice of radiation for sterilization
goafrit   7/9/2014 8:50:16 PM
NO RATINGS
>>  I have heard of radiation hardened FPGAs being used but do not have much idea about the memory.  

You go with floating gates memory. I have seen that being adopted for most space-focussed memory designs. That can be used here.

goafrit
User Rank
Manager
Re: Choice of radiation for sterilization
goafrit   7/9/2014 8:48:22 PM
NO RATINGS
>>  And that radiation has to be cheaply provided

My experience in the medical device is that the components command good premium compared to the consumer market. So, this can be done. I know for example in MEMS, you can sell a unit of XL for $60 compared with $0.60 you can get in the consumer market.

y_sasaki
User Rank
CEO
MEMS memory?
y_sasaki   7/9/2014 6:19:44 PM
NO RATINGS
I remember I've read article on Scientific American IBM at that time was investigated MEMS memory - essentially atomic-size abacus. I never heard what happend to that technology, probably dead-ended. Sad, if they've kept the development, it could be highly tolerant to radiation memory.

resistion
User Rank
CEO
Re: Choice of radiation for sterilization
resistion   7/9/2014 11:37:13 AM
NO RATINGS
Yes one needs radiation-hard CMOS to control radiation-hard memory. How do the sterilized devices use memory or even CMOS now?

Sanjib.A
User Rank
CEO
Re: Choice of radiation for sterilization
Sanjib.A   7/8/2014 11:38:07 PM
NO RATINGS
@resistion: You have made an excellent point!! If there is a way to control the radiation such that the radiation serves its purpose without damaging the semiconductor while keeping the cost lower than what it would be with the CBRAMs, that should make the case for it. 

Are the CBRAMs equivalent to FLASH functionally? Currently what kind of memory chips being used in space equipments, for which the radiation threats are similar? I have heard of radiation hardened FPGAs being used but do not have much idea about the memory.  

resistion
User Rank
CEO
Choice of radiation for sterilization
resistion   7/8/2014 9:44:46 PM
NO RATINGS
If the purpose is sterilization, you have to choose a radiation that kills the germs without killing the CMOS. And that radiation has to be cheaply provided. Generally the thinner the memory layer the less likely the radiation would deposit damaging energy.

Flash Poll
Radio
LATEST ARCHIVED BROADCAST
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Top Comments of the Week